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Plugin API/Filter Reference/sanitize title

sanitize_title is a filter applied to a value to be cleaned up for use in a URL by the function sanitize_title().

function my_sanitize_title($title, $raw_title, $context) {
    # ...
}
add_filter('sanitize_title', 'my_sanitize_title', 10, 3);

$title

(string) (required) The string to be sanitized.

Default: None

$raw_title

(string) (optional) The original string, before being sanitized by sanitize_title().

Default: None

$context

(string) (optional) The operation for which the string is sanitized.

Default: None

Require URL component be lower-cased:

add_filter('sanitize_title', 'strtolower');

Replace plusses with dashes:

function plush_to_dash($title) {
    return str_replace('+', '-', $title);
}
add_filter('sanitize_title', 'plus_to_dash');

This filter is applied by: